Hello everyone! Is anybody can help me to solve this silly question that unfortunately I haven't found the right way to address it. Supose I have a matrix X[n,n] dimension I would like to calculate the product of the vectors Y=X[1,n]*X[n,1] Then I would like to run the following operation H=if(Y>0) {H[,1]=1} The problem is that the condition "if" works only for the first element of the matrix. Does anybody knows how to apply the conditional "if" to a entire vector? cheers Guillermo This message has been scanned for viruses by TRENDMICRO, an IESE technology affiliate company and global leader in antivirus and content security software.
I think this is what you want. Y[Y>0] <- 1 --- "Armelini, Guillermo" <DOCGArmelini at iese.edu> wrote:> Hello everyone! > > Is anybody can help me to solve this silly question > that unfortunately I haven't found the right way to > address it. > > Supose I have a matrix X[n,n] dimension > > I would like to calculate the product of the vectors > > Y=X[1,n]*X[n,1] > > Then I would like to run the following operation > > H=if(Y>0) {H[,1]=1} > > The problem is that the condition "if" works only > for the first element of the matrix. > > Does anybody knows how to apply the conditional "if" > to a entire vector? > > cheers > > Guillermo > > > > This message has been scanned for viruses by > TRENDMICRO, > an IESE technology affiliate company and global > leader in antivirus and content security software. > > ______________________________________________ > R-help at r-project.org mailing list > stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > R-project.org/posting-guide.html > and provide commented, minimal, self-contained, > reproducible code. >Looking for the perfect gift? Give the gift of Flickr!
?ifelse -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.snow at imail.org (801) 408-8111> -----Original Message----- > From: r-help-bounces at r-project.org > [mailto:r-help-bounces at r-project.org] On Behalf Of Armelini, Guillermo > Sent: Wednesday, December 19, 2007 10:21 AM > To: r-help at stat.math.ethz.ch > Subject: [R] question > > Hello everyone! > > Is anybody can help me to solve this silly question that > unfortunately I haven't found the right way to address it. > > Supose I have a matrix X[n,n] dimension > > I would like to calculate the product of the vectors > > Y=X[1,n]*X[n,1] > > Then I would like to run the following operation > > H=if(Y>0) {H[,1]=1} > > The problem is that the condition "if" works only for the > first element of the matrix. > > Does anybody knows how to apply the conditional "if" to a > entire vector? > > cheers > > Guillermo > > > > This message has been scanned for viruses by TRENDMICRO, an > IESE technology affiliate company and global leader in > antivirus and content security software. > > ______________________________________________ > R-help at r-project.org mailing list > stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >